1. Department of Geosciences, Virginia Tech, Blacksburg, Virginia 24061, United States
2. Department of Earth System Science, Stanford University, Stanford, California 94305, United States
3. Advanced Photon Source, Argonne National Laboratory, Lemont, Illinois 60439, United States
4. Department of Civil and Environmental Engineering, University of Connecticut, Storrs, Connecticut 06269, United States
5. Department of Earth, Environmental & Resource Sciences, The University of Texas at El Paso, El Paso, Texas 79968, United States
6. Division of Nanoscience, Academy of Integrated Science, Virginia Tech, Blacksburg, Virginia 24061, United States